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  NIHAO XV: the environmental impact of the host galaxy on galactic satellite and field dwarf galaxies

Buck, T., Macciò, A. V., Dutton, A. A., Obreja, A., & Frings, J. (2019). NIHAO XV: the environmental impact of the host galaxy on galactic satellite and field dwarf galaxies. Monthly Notices of the Royal Astronomical Society, 483, 1314-1341.

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 Creators:
Buck, Tobias1, Author
Macciò, Andrea V.1, Author
Dutton, Aaron A.1, Author
Obreja, Aura1, Author
Frings, Jonas1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: methods: numerical Galaxy: formation galaxies: kinematics and dynamics Local Group dark matter Astrophysics - Astrophysics of Galaxies
 Abstract: We study the impact of the host on dwarf galaxy properties using four new Milky Way (MW)-like, ultra-high-resolution simulations (Npart > 107) from the NIHAO project. We split our sample into satellite (R < R200), nearby (1 < R/R200 < 2.5), and field (R > 2.5R200) galaxies. Simulated galaxies from all three groups are in excellent agreement with Local Group dwarf galaxies in terms of the stellar mass- velocity dispersion and stellar mass-metallicity relations, star formation histories, and stellar mass functions. Satellites and nearby galaxies show lower velocity dispersions and gas fractions compared to field galaxies. While field galaxies follow global abundance matching relations, satellites and nearby galaxies deviate from them, showing lower dark matter masses for a given stellar mass. The reason for this deficit in dark matter mass is the substantial mass loss experienced by satellites and ̃80 per cent of the nearby galaxies while orbiting inside R200 at earlier times. However, both satellites and nearby objects fall back on to the relation for field galaxies if we use the maximum of their virial mass instead of the present-day value. This allows us to provide estimates for the peak masses of observed Local Group galaxies. Finally, using radial velocities, distances, and the velocity dispersion-stellar mass relation from our simulations, we derive a metric to distinguish between galaxies harassed by the central object and unaffected ones. Applying this metric to observed objects, we find that even far-away dwarf galaxies like Eri II (D ≈ 370 kpc) have a strong probability (≈83 per cent) of having been affected by the MW in the past. This naturally explains the lack of gas and recent star formation seen in Eri II.

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 Dates: 2019
 Publication Status: Published in print
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 483 Sequence Number: - Start / End Page: 1314 - 1341 Identifier: -